[i915] Unable to set Display to max resolution supported by Monitor and laptop

[jerry collins]

Hi,

my secondary display support 2560*1440 but 'Display' in Ubuntu is presenting a max resolution of 2048*1080.

The max resolution was working yesterday, I think I performed a update today and it has stopped working after that.

Thanks,
Jerry,

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.11.0-41.45~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Dec 14 19:52:57 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:504a]
InstallationDate: Installed on 2021-04-16 (242 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
MachineType: LENOVO 20F5S2BL00
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-41-generic root=UUID=5cb08771-ead9-4f2c-9550-4125931d1f4a ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/09/2019
dmi.bios.release: 1.45
dmi.bios.vendor: LENOVO
dmi.bios.version: R02ET72W (1.45 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20F5S2BL00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40705 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.15
dmi.modalias: dmi:bvnLENOVO:bvrR02ET72W(1.45):bd10/09/2019:br1.45:efr1.15:svnLENOVO:pn20F5S2BL00:pvrThinkPadX260:skuLENOVO_MT_20F5_BU_Think_FM_ThinkPadX260:rvnLENOVO:rn20F5S2BL00:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X260
dmi.product.name: 20F5S2BL00
dmi.product.sku: LENOVO_MT_20F5_BU_Think_FM_ThinkPad X260
dmi.product.version: ThinkPad X260
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.105-3~20.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.5
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel van Vugt (vanvugt)]

The EDID data reported by the monitor (decoded from XorgLog.txt) mentions the correct resolution:

EDID version: 1.3
Manufacturer: DEL Model 16619 Serial Number 842152019
Made in week 32 of 2017
Digital display
Maximum image size: 60 cm x 34 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
First detailed timing is preferred timing
Color Characteristics
  Red: 0.6396, 0.3300
  Green: 0.2998, 0.5996
  Blue: 0.1503, 0.0595
  White: 0.3134, 0.3291
Established Timings I & II
    720x400 70.082 Hz 9:5 31.467 kHz 28.320 MHz (IBM)
    640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (DMT)
    640x480 75.000 Hz 4:3 37.500 kHz 31.500 MHz (DMT)
    800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz (DMT)
    800x600 75.000 Hz 4:3 46.875 kHz 49.500 MHz (DMT)
   1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz (DMT)
   1024x768 75.029 Hz 4:3 60.023 kHz 78.750 MHz (DMT)
   1280x1024 75.025 Hz 5:4 79.976 kHz 135.000 MHz (DMT)
Standard Timings
   1152x864 75.000 Hz 4:3 67.500 kHz 108.000 MHz (DMT)
   1600x1200 60.000 Hz 4:3 75.000 kHz 162.000 MHz (DMT)
   1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz (DMT)
   1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (DMT)
Detailed mode: Clock 241.500 MHz, 597 mm x 336 mm
               2560 2608 2640 2720 ( 48 32 80)
               1440 1443 1448 1481 ( 3 5 33)
               +hsync -vsync
               VertFreq: 59.951 Hz, HorFreq: 88.787 kHz
Display Product Serial Number: J0XYN78B228S
Display Product Name: DELL U2717D
Display Range Limits
  Monitor ranges (GTF): 50-75 Hz V, 30-88 kHz H, max dotclock 250 MHz
Has 1 extension block
Checksum: 0xcd

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1901470, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.