Bug 83370

Summary:	SiS 6326 fails at 1024x768x24
Product:	[Retired] Red Hat Linux	Reporter:	Alan Cox <alan>
Component:	XFree86	Assignee:	Mike A. Harris <mharris>
Status:	CLOSED WONTFIX	QA Contact:	David Lawrence <dkl>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	9
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2003-11-12 00:08:10 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Alan Cox 2003-02-03 14:16:11 UTC

The SiS drivers (both ours and Thomas) allow 1024x768x24 (and our config tools
prefer it). However the card apparently cannot manage that mode and runs out of
memory bandwidth or something (the results are pretty but not useful).

We should probably block  > 800x600 at 24bit on the 6326 to avoid the problem
occurring. 16bit is fine.

Comment 1 Mike A. Harris 2003-02-03 14:52:49 UTC

Here are the modes the SiS 6326 specs show the hardware supports:

Supports super high resolution graphics modes
- 640x480		256/32K/64K/16M colors 85Hz NI
- 800x600		16/256/32K/64K/16M colors 85Hz NI
- 1024x768		16/256/32K/64K/16M colors 85Hz NI
- 1280x1024	16/256/32K/64K colors 75 Hz NI
- 1600x1200	16/256 colors 65Hz NI
- low resolution modes  (hidden)

By this chart, it should run in 1024x768x24bit at max of 85Hz refresh.
Could you attach your log file from it trying to start up at 1024x768x24?
Perhaps I can spot something in the code.  Also, if you would like, I
can give you a copy of the specs for this card if you don't have 'em.

Comment 2 Alan Cox 2003-02-03 15:05:04 UTC

Works at 1024x768x60 @24bit
Fails at 72

Assuming your numbers are the final ones for the hardware and the vendor didnt
use crappier RAM (since I note you can strap the chip for multiple RAM speeds)
maybe the driver is
using 32bit with 8bit unused not packed 24 bit ?

Alan

Comment 3 Alan Cox 2003-11-12 00:08:10 UTC

hardware issue, cant really be handled in software automatically.