Bug 140848 - [PATCH] wrong mode timings in vga16fb.c require "nofb" installation
Summary: [PATCH] wrong mode timings in vga16fb.c require "nofb" installation
Alias: None
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel   
(Show other bugs)
Version: 3.0
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Peter Martuccelli
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2004-11-25 15:08 UTC by Martin Wilck
Modified: 2007-11-30 22:07 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2007-01-23 19:08:33 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
patch that fixes the problem (954 bytes, patch)
2004-11-25 15:12 UTC, Martin Wilck
no flags Details | Diff
patch for kernel 2.6 (1008 bytes, patch)
2004-11-25 15:12 UTC, Martin Wilck
no flags Details | Diff

Description Martin Wilck 2004-11-25 15:08:55 UTC
Description of problem:

The mode timings of the default 640x480-60 mode in
drivers/video/vga16fb.c do not work with some LCD displays 
because they deviate slightly from the standard. In particular, the
screen height is wrong (529 vs. 525 pixels)

Version-Release number of selected component (if applicable):
2.4.21-20.EL and all others

How reproducible:
E.g. Installing RH on a system with an LCD screen that can't hanlde
slightly wrong VGA timings, without the "nofb" installation option.

Steps to Reproduce:
1.Install RH 

Actual results:
Screen will become black (or garbled, depending on display device)
after loader starts

Expected results:
Screen remains readable

Additional info:
I'll attach a patch. Problem was already discussed on the
linux-fbdev-devel mailing list.

Comment 1 Martin Wilck 2004-11-25 15:11:11 UTC
Link to linux-fbdev-devel thread:


Comment 2 Martin Wilck 2004-11-25 15:12:10 UTC
Created attachment 107461 [details]
patch that fixes the problem

Comment 3 Martin Wilck 2004-11-25 15:12:53 UTC
Created attachment 107462 [details]
patch for kernel 2.6

Comment 5 Peter Martuccelli 2007-01-23 19:08:33 UTC
Closing out as wontfix for RHEL3.

Note You need to log in before you can comment on or make changes to this bug.