hangs using opengl

Quoted 31 lines · Denis Vlasenko

Quoted 18 lines · Nix N. Nix

Quoted 18 lines

Via has recently released a patch to Via-chipset based boards that addresses issues Windows XP users have been experiencing (BSODs and friends) while playing OpenGL games, especially with NVidia chips. The problem and the description of the fix (as taken from the Readme.txt from Via's patch) are as follow:

So what does it do? It closes the RX55 memory register in BIOS. The RX55 register's official name and function is Memory Write Queue (MWQ) timer. The MWQ timer is actually a timing device included in the memory host controller to prevent write data being held in the memory queue too long. After the data has been in the queue too long it times out. This timed out data is then given a higher write request priority. Now that might sound nice a bit of extra performance BUT the procedure fails when overloaded. 3D games and Win XP put too much load on the memory queuing timer procedure. The nVidia new driver exaggerates the problem even more as the driver enables nVidia cards to use even more memory than previous driver versions.

[snip]

Quoted 8 lines

Quoted 8 lines

In light of VIAs discoveries, and the fact that the patch that they now have available for Windows is not available for Linux also, I was wondering if somebody on this list may be kind enough to help us with what may very well be the symptoms of the same problem, but on Linux. Could the code that accomplishes the above (turn off the RX55 register) be made into a patch that can be applied to the kernel, thus providing an equivalent patch for Linux systems ?

Quoted 2 lines

Athlon bug stomper is already in mainline. If latest kernel does not work for you, check that register (man lspci) and 0x95 also. Try to disable them (man

I did lspci -vv -xxx
Each entry is followed by a table of hex. Is it entries 0x55 and 0x95 in that table that you're referring to ? If so, well, they're both 0:

01:00.0 VGA compatible controller: nVidia Corporation NV11 (rev a1) (prog-if 00 [VGA])
Subsystem: Asustek Computer, Inc.: Unknown device 4015
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

        Latency: 248 (1250ns min, 250ns max)
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at ee000000 (32-bit, non-prefetchable)

[size=16M]
Region 1: Memory at f0000000 (32-bit, prefetchable) [size=128M] Expansion ROM at efff0000 [disabled] [size=64K]
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [44] AGP version 2.0
Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2
Command: RQ=31 SBA- AGP+ 64bit- FW- Rate=x2

00: de 10 10 01 07  00  b0 02 a1 00 00 03 00 f8 00 00
10: 00 00 00 ee 08  00  00 f0 00 00 00 00 00 00 00 00
20: 00 00 00 00 00  00  00 00 00 00 00 00 43 10 15 40
30: 00 00 00 00 60  00  00 00 00 00 00 00 0b 01 05 01
40: 43 10 15 40 02  00  20 00 17 00 00 1f 02 01 00 1f
50: 01 00 00 00 01 [00] 00 00 ce d6 23 00 0f 00 00 00
60: 01 44 02 00 00  00  00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00

90: 00 00 00 00 00 [00] 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Quoted 4 lines

setpci). Report back - we may need to further improve stomper. --
vda