Created attachment 473148 [details]
corrupted characters displayed when most of the characters on the rows of a keyboard were typed sequentially in a text editor window
Description of problem:
Several times upon Resume from Hibernation, the display is partially corrupted. The first portion of a screenshot attached below shows the characters displayed when most of the characters on the rows of a keyboard were typed sequentially in a text editor window. This file was saved, the second portion of a screenshot shows the characters displayed when this saved file was displayed in the same text editor after the system had been Shutdown and Restarted. Lest one think this bug arises merely in the text editor, the same garbage is displayed in the web browser, gnome applets, etc. or every window in sight. Attempts at forcing a window to be redrawn, e.g. minimizing and restoring, or paging / scrolling to "new" material does not cure the disease. Speculation that this is yet another set of symptoms for yet another corruption of the (shared) memory (no dedicated graphics memory for this adapter, it uses a portion of system memory) during the Hibernation or the Resume with these Intel 915G graphics.
[Yes, corrupting video memory is "better" than corrupting random bits of the filesystem, etc. as previous incarnations of this software has done. But are there non-video bits that are messed up too, just not noticed yet?]
While this has happened several times, it does not occur upon *every* Resume from Hibernation (i.e. some Resumes work as expected).
Once shutdown progresses into character mode, the characters there are the normal expected (US English) characters
Version-Release number of selected component (if applicable):
[u@who ~]$ uname -a
Linux 209 18.104.22.168-74.fc14.i686 #1 SMP Thu Dec 23 16:17:40 UTC 2010 i686 i686 i386 GNU/Linux
How reproducible: approximately 50% chance
Steps to Reproduce:
3. Notice whether you can read anything.
Unusable system, must Shutdown, Restart.
Able to read unlock screen prompt, window titles, file contents, and all displayed text just as before the Hibernate.
I once saw a window with corrupted characters self-heal into the correct characters several minutes after the Resume had completed. I am unaware of the cause of that miracle, but since all other windows still contained corrupted characters, I had to Shutdown, Restart to obtain a usable system anyway.
- - - [from /var/log/Xorg.0.log]:
[ 153.558] (==) FontPath set to:
[ 153.650] (II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
i810-dc100, i810e, i815, i830M, 845G, 852GM/855GM, 865G, 915G,
E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G,
965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45,
4 Series, G45/G43, Q45/Q43, G41, B43, Clarkdale, Arrandale
[ 153.650] (II) VESA: driver for VESA chipsets: vesa
[ 153.651] (II) FBDEV: driver for framebuffer: fbdev
[ 153.696] (II) intel(0): Integrated Graphics Chipset: Intel(R) 915G
[ 153.696] (--) intel(0): Chipset: "915G"
- - -
Created attachment 473150 [details]
normal characters displayed when this saved file was displayed in the same text editor after the system had been Shutdown and Restarted
Created attachment 473152 [details]
corrupted desktop background shown upon Resume
Confirming the same on x86_64 F15 alpha with KDE
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
(II) intel(0): Integrated Graphics Chipset: Intel(R) GM45
(--) intel(0): Chipset: "GM45"
The problem is still here fedora 15 x86_64
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 3a02
Flags: bus master, fast devsel, latency 0, IRQ 46
Memory at f4000000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 1800 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset
OpenGL version string: 2.1 Mesa 7.11-devel
OpenGL shading language version string: 1.20
Ive had this problem since fedora 12. Any word on how to solve it?
I upgraded to kernel-3.1 rc for F16 (I use F15) via koji.fedoraproject.org and it seems that it helped.
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