screen remote screen update errors when scaling turned on - new bug for 13.04

[Craig Hansen]

I just upgraded a netbook system from 12.10 to 13.04, which reports version 3.8.0 for vinagre. Because the netbook screen is small (1024x600), I turn on "scaling" using the button which is labelled "Fits the remote screen into current window size". Once scaling is turned on, screen updates start messing up, particularly updates to the top bar, which tend to be drawn about a dozen pixels too low and about two dozen too far to the right. When switching applications between, say firefox and vinagre, when I return to vinagre, I find vinagre has an entire screen update drawn in this shifted position, which then gets partially updated in the correct position as I drag the mouse pointer across the screen, except for the top bar which continues to get drawn out of place.

When I turn scaling off, the display updates correctly, but of course there are scrolling bars that need to manipulated to see then entire remote screen. I get correct results when using remmina, including for scaled displays.

This bug is new to 13.04 - I didn't have this problem in 12.10. The system uses no proprietary display drivers (such as the NVidia or ATI drivers for which Xdamage handling has been a problem in the past) - the netbook has the Intel 945GSE graphics controller.

Here's the output from lspci:

00:00.0 Host bridge: Intel Corporation Mobile 945GSE Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 3 (rev 02)
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 02)
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 02)
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [AHCI mode] (rev 02)
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02)
01:00.0 Ethernet controller: Atheros Communications Inc. AR242x / AR542x Wireless Network Adapter (PCI-Express) (rev 01)
03:00.0 Ethernet controller: Qualcomm Atheros AR8132 Fast Ethernet (rev c0)

Here's the output from xdpyinfo:

name of display: :0
version number: 11.0
vendor string: The X.Org Foundation
vendor release number: 11303000
X.Org version: 1.13.3
maximum request size: 16777212 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 7
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 4, bits_per_pixel 8, scanline_pad 32
    depth 8, bits_per_pixel 8, scanline_pad 32
    depth 15, bits_per_pixel 16, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
    depth 24, bits_per_pixel 32, scanline_pad 32
    depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0x4600006, revert to Parent
number of extensions: 28
    BIG-REQUESTS
    Composite
    DAMAGE
    DOUBLE-BUFFER
    DPMS
    DRI2
    GLX
    Generic Event Extension
    MIT-SCREEN-SAVER
    MIT-SHM
    RANDR
    RECORD
    RENDER
    SECURITY
    SGI-GLX
    SHAPE
    SYNC
    X-Resource
    XC-MISC
    XFIXES
    XFree86-DGA
    XFree86-VidModeExtension
    XINERAMA
    XInputExtension
    XKEYBOARD
    XTEST
    XVideo
    XVideo-MotionCompensation
default screen number: 0
number of screens: 1

screen #0:
  dimensions: 1024x600 pixels (270x158 millimeters)
  resolution: 96x96 dots per inch
  depths (7): 24, 1, 4, 8, 15, 16, 32
  root window id: 0x7f
  depth of root window: 24 planes
  number of colormaps: minimum 1, maximum 1
  default colormap: 0x22
  default number of colormap cells: 256
  preallocated pixels: black 0, white 16777215
  options: backing-store NO, save-unders NO
  largest cursor: 64x64
  current input event mask: 0x7bc03f
    KeyPressMask KeyReleaseMask ButtonPressMask
    ButtonReleaseMask EnterWindowMask LeaveWindowMask
    KeymapStateMask ExposureMask VisibilityChangeMask
    StructureNotifyMask SubstructureNotifyMask SubstructureRedirectMask
    FocusChangeMask PropertyChangeMask
  number of visuals: 12
  default visual id: 0x20
  visual:
    visual id: 0x20
    class: TrueColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x21
    class: DirectColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x75
    class: TrueColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x76
    class: TrueColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x77
    class: TrueColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x78
    class: TrueColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x79
    class: DirectColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x7a
    class: DirectColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x7b
    class: DirectColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x7c
    class: DirectColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x7d
    class: DirectColor
    depth: 24 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits
  visual:
    visual id: 0x5c
    class: TrueColor
    depth: 32 planes
    available colormap entries: 256 per subfield
    red, green, blue masks: 0xff0000, 0xff00, 0xff
    significant bits in color specification: 8 bits

lsb_release -rd:
Description: Ubuntu 13.04
Release: 13.04

apt-cache policy vinagre:
vinagre:
  Installed: 3.8.0-1
  Candidate: 3.8.0-1
  Version table:
 *** 3.8.0-1 0
        500 http://archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status

[Craig Hansen (craig-hansen)]

Additional image showing screen with a trail of correctly-located updates following the mouse pointer partially cleaning up the incorrectly drawn screen update.