I am using a Dell Latitude D430 with an Intel GM945.
When I use my external 19" TFT (through DVI, 1280x1024), I occasionally get a black screen. This is not triggered by anything obvious, it just happens spontaneously. It is impossible to recover from this with restarting X, only a reboot cures it.
Further investigation shows that this is caused by a long series of
(EE) intel(0): underrun on pipe A!
errors (some 10.000 lines in the log). I get short underruns pretty often, which results in the screen flickering for a split second, but when the long series happens, the screen stays black forever.
A comparison of the intel_reg_dump output (-: works, +: black screen) confirms this as well:
Binary package hint: xserver- xorg-video- intel
I am using a Dell Latitude D430 with an Intel GM945.
When I use my external 19" TFT (through DVI, 1280x1024), I occasionally get a black screen. This is not triggered by anything obvious, it just happens spontaneously. It is impossible to recover from this with restarting X, only a reboot cures it.
Further investigation shows that this is caused by a long series of
(EE) intel(0): underrun on pipe A!
errors (some 10.000 lines in the log). I get short underruns pretty often, which results in the screen flickering for a split second, but when the long series happens, the screen stays black forever.
A comparison of the intel_reg_dump output (-: works, +: black screen) confirms this as well:
-(II): PIPEASTAT: 0x00000203 (status: VSYNC_INT_STATUS VBLANK_INT_STATUS OREG_UPDATE_STATUS)
+(II): PIPEASTAT: 0x80000000 (status: FIFO_UNDERRUN)
I have not observed this behaviour when I use the laptop undocked, with the internal screen (1280x800).
This is current Jaunty with -intel 2:2.5.1-1ubuntu7. It also happened in Intrepid, but back then I didn't know about intel_reg_dumper.
ProblemType: Bug xorg-video- intel 2:2.5.1-1ubuntu7
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: xserver-
ProcEnviron:
PATH: custom, user
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcVersion: Linux version 2.6.28-4-generic (buildd@palmer) (gcc version 4.3.3 20081217 (prerelease) (Ubuntu 4.3.2-2ubuntu9) ) #5-Ubuntu SMP Fri Dec 26 22:48:51 UTC 2008
SourcePackage: xserver- xorg-video- intel
Uname: Linux 2.6.28-4-generic i686
xkbcomp: