Bug 13817
| Summary: | video output scrambled with KMS on i915 | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Matthieu Verbert (matthieu.verbert) |
| Component: | Video(DRI - non Intel) | Assignee: | Jesse Barnes (jbarnes) |
| Status: | RESOLVED CODE_FIX | ||
| Severity: | normal | CC: | jbarnes |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.31-rc3 | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
| Attachments: | video of my screen while moving a terminal | ||
some hardware details (from lspci -vvv):
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
Subsystem: Dell Device 01cc
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 16
Region 0: Memory at eff00000 (32-bit, non-prefetchable) [size=512K]
Region 1: I/O ports at eff8 [size=8]
Region 2: Memory at d0000000 (32-bit, prefetchable) [size=256M]
Region 3: Memory at efec0000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [d0] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
the laptop is a Dell Latitude D820 (bios version A09 fwiw).
Let me know if you need more details.
Should be fixed soon, patches are on their way upstream: http://git.kernel.org/?p=linux/kernel/git/anholt/drm-intel.git;a=shortlog;h=drm-intel-next (see the last couple of FIFO related fixes) I tried this tree on top of 2.6.31-rc4, and it indeed works (glxgears even reports that it's slightly faster than before). Thanks for the hint ! Thanks for testing! any plan to merge it for rc6 ? I missed the pull request on LKML, but rc5-git5 now works OOB. Thanks! |
Created attachment 22468 [details] video of my screen while moving a terminal When using KMS, the console is occasionally scrambled (like a shadow image appearing and disappearing very quickly). It is even more visible when X is started, as moving any window can trigger the bug and renders the screen completely unreadable (I recorded a (admittedly really lousy) video with my phone in case the description is not good enough). I bisected the problem and the problem started with commit 7662c8bd6545c12ac7b2b39e4554c3ba34789c50 (drm/i915: add FIFO watermark support), which appeared in Linus's tree between 2.6.31-rc2 and 2.6.31-rc3. I have _not_ tried to revert just this patch (as I have no clue whether following patches depend on it or not), but I'm open to try any patch (as time permits, it's my work machine too). Thanks, Matthieu