https://bugs.freedesktop.org/show_bug.cgi?id=108139
Bug ID: 108139
Summary: My HDMI stopped working at Linux 4.18.8
Product: DRI
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/AMDgpu
Assignee: dri-devel@lists.freedesktop.org
Reporter: duncan_...@optusnet.com.au
At Linux 4.18.8 the HDMI monitor started to report "No Signal" although Xorg
can see a screen when it's started.(There's no signal with or without X).
Using bisection, I found the change that caused this is commit to be
691f2d763d0731224439686ecf2d440df8fe910e:
+++ b/drivers/gpu/drm/amd/display/dc/bios/command_table.c
@@ -808,6 +808,24 @@ static enum bp_result transmitter_control_v1_5(
* (=1: 8bpp, =1.25: 10bpp, =1.5:12bpp, =2: 16bpp)
* LVDS mode: usPixelClock = pixel clock
*/
+ if (cntl->signal == SIGNAL_TYPE_HDMI_TYPE_A) {
+ switch (cntl->color_depth) {
+ case COLOR_DEPTH_101010:
+ params.usSymClock =
+ cpu_to_le16((le16_to_cpu(params.usSymClock) *
30) / 24);
+ break;
+ case COLOR_DEPTH_121212:
+ params.usSymClock =
+ cpu_to_le16((le16_to_cpu(params.usSymClock) *
36) / 24);
+ break;
+ case COLOR_DEPTH_161616:
+ params.usSymClock =
+ cpu_to_le16((le16_to_cpu(params.usSymClock) *
48) / 24);
+ break;
+ default:
+ break;
+ }
+ }
if (EXEC_BIOS_CMD_TABLE(UNIPHYTransmitterControl, params))
result = BP_RESULT_OK;
Inserted printk stmts showed my monitor reports COLOR_DEPTH_121212. I suspect
the clock speed is too high for the video card, so the code needs to check the
card model before bumping the speed, but I don't know how to do that.
Here are all the details I an think of:
Video card (from lspci): VGA compatible controller:
Advanced Micro Devices, Inc. [AMD/ATI] Radeon R2 Graphics (rev ea)
Monitor (from /var/log/Xorg.0.log): Monitor name: DELL U2711
Ranges: V min: 49 V max: 86 Hz, H min: 29 H max: 113 kHz, PixClock max 285 MHz
Hardware name (from /var/log/debug):
HP HP Laptop 15-bw0xx/8330, BIOS F.11 07/05/2017
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