Bug 215355 - black screen and show "the current input timing is not supported by the monitor display"
Summary: black screen and show "the current input timing is not supported by the monit...
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Console/Framebuffers (show other bugs)
Hardware: All Linux
: P1 blocking
Assignee: James Simmons
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-12-18 08:27 UTC by Z. Liu
Modified: 2021-12-18 08:41 UTC (History)
0 users

See Also:
Kernel Version: since v5.6-rc2
Subsystem:
Regression: No
Bisected commit-id:

Attachments
[patch] fix black screen on some monitor (510 bytes, patch)
2021-12-18 08:41 UTC, Z. Liu 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description Z. Liu 2021-12-18 08:27:40 UTC 
after updated kernel to 5.10, monitor become black w/ error message said:
"The current input timing is not supported by the monitor display. Please change your input timing to 1920x1080@60Hz ...", so I did a git bisect, and the result is:

# first bad commit: [11be60bd66d5431018d706ec623c8ece80a7f931] matroxfb: add Matrox MGA-G200eW board support

Display become normal after apply following patch:

diff --git a/drivers/video/fbdev/matrox/matroxfb_base.c b/drivers/video/fbdev/matrox/matroxfb_base.c
index 5c82611e93d9..236521b19daf 100644
--- a/drivers/video/fbdev/matrox/matroxfb_base.c
+++ b/drivers/video/fbdev/matrox/matroxfb_base.c
@@ -1377,7 +1377,7 @@ static struct video_board vbG200 = {
        .lowlevel = &matrox_G100
 };
 static struct video_board vbG200eW = {
-       .maxvram = 0x800000,
+       .maxvram = 0x100000,
        .maxdisplayable = 0x800000,
        .accelID = FB_ACCEL_MATROX_MGAG200,
        .lowlevel = &matrox_G100

I don't really know the meaning of the value I changed, just use this value from 
 vbG200 for a test.
Comment 1 Z. Liu 2021-12-18 08:41:10 UTC 
Created attachment 300061 [details]
[patch] fix black screen on some monitor

Monitor become black w/ error message said: "The current input timing is not supported by the monitor display. Please change your input timing to 1920x1080@60Hz ...".

Display show normaly after apply the patch.
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