[Linux-fbdev-devel] Tridentfb troubles

[viking <vi...@fl...>]

On Mon, Mar 21, 2005 at 12:44:26PM -0800, Andrew Morton wrote:
> 
> Guys, we seem to have a tridentfb regression in 2.6.12-rc1.
> 
> viking <vi...@fl...> wrote:
> >
> > Also (and this is something I've noticed since I tried tridentfb) the video
> >  buffer never seems to get cleared, except when I change virtual terminals,
> >  then change back to the terminal concerned. THEN it's cleared. So for the
> >  moment, I've gone back to using VESAfb.

**********
Actually, it's in every release I've ever tested. 
**********

I hadn't mentioned it before, because vesafb does what I want, apart from not
being resizable.  I have a Apollo MVP4, VIA686A (or B) video chipset, though
the Video shows itself as a CyberBlade/i7:

brick$ lspci -v -v
...
01:00.0 VGA compatible controller: Trident Microsystems CyberBlade/i7 (rev 5d)
(prog-if 00 [VGA])
Subsystem: FIRST INTERNATIONAL Computer Inc: Unknown device 9915
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: 32
Interrupt: pin A routed to IRQ 10
Region 0: Memory at e5800000 (32-bit, non-prefetchable) [size=8M]
Region 1: Memory at e6000000 (32-bit, non-prefetchable) [size=128K]
Region 2: Memory at e5000000 (32-bit, non-prefetchable) [size=8M]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [80] AGP version 1.0
Status: RQ=33 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3-
Rate=x1,x2
Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
Capabilities: [90] Power Management version 1
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-


I have via-agp and agpgart loaded, though those aren't for 2d. Not sure what
else to tell you, to be honest. If I put BOTH the vesafb AND the tridentfb
into the kernel, and select vesafb on lilo (video=vesafb:mtrr,ypan), the
kernel boots up using tridentfb regardless.

The 640x480-60 (the one the kernel seems to boot up on unless told otherwise)
screenmode looks absolutely shocking, with a very wiggly screen mainly in the
X direction. That's probably due to the definition in drivers/video/modedb.c,
something I can either tweak myself, or avoid using.

I'll do more testing, see what I come up with aside from that. You may need to
tell me what other details you want though.

Andrew - you still wish to be CC:ed on this video issue?

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