On the following chipset, the display suffers from "stuttering":
06:00.0 VGA compatible controller: NVIDIA Corporation GT200b [GeForce GTX 285] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd Device 34c9
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, Cache Line Size: 256 bytes
Interrupt: pin A routed to IRQ 24
Region 0: Memory at f7000000 (32-bit, non-prefetchable) [size=16M]
Region 1: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 3: Memory at f8000000 (64-bit, non-prefetchable) [size=32M]
Region 5: I/O ports at dc00 [size=128]
Expansion ROM at f6f80000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nouveau
[ 531.742] (--) NOUVEAU(0): Chipset: "NVIDIA NVA0"
By "stutters" I mean that at random intervals, at least several times a
minute, the entire display completely freezes, for an interval ranging
between about quarter of a second, to sometimes as long as 5-6 seconds.
By "freezes" I mean that it just stops updating. No artifacts, just a frozen display.
When the display eventually becomes unstuck, it's completely up to date. Everything that should be rendered, to that point, is rendered. It's as if the framebuffer continues to get updated normally, but the display is not being refreshed. Except for the mouse pointer! When the display is not refreshing, the mouse pointer continues to be responsive.
Basically, if I'm playing some video, the audio keeps going, the video stops for 1-6 seconds, then continues running, synchronized with the audio. Or, if I'm typing something on the terminal, after the display unsticks itself, everything that was typed in the interim, is where it should be. That's the best way I can describe it.
I see no complaints in /var/log/messages, nor in Xorg.0.logI have the same kernel, nouveau, and Xorg version running on different hardware with an NVC1 chipset, no issues there. That display is smooth as butter.
I'm fairly certain that this is a recent regression. I've had this hardware for at least three years, and this problem is fairly recent. Can't quite recall at which kernel/Xorg/nouveau version this started happening.
I don't think it's a bad DVI cable. If I drop out of X, and to som work on the console terminal (VESA framebuffer display only), the display does not appear to stutter at all.
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