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radio_flyer
Apprentice
Apprentice


Joined: 04 Nov 2004
Posts: 260
Location: Northern California

PostPosted: Sat Oct 01, 2016 12:32 am    Post subject: gentoo-sources-4.4.21 and strange VT resolution Reply with quote

With the stabilization of 4.4.21 a few days ago, one of my desktops has suddenly developed a VT resolution problem. When booting, as soon as the system switches to the framebuffer the display goes into what appears to be 1024x768 mode. The monitor is 1920x1200 (Dell U2412M), and the boot continues with the console output clearly visible but present only on the top left corner of the monitor. The rest of the monitor is blank. The SDDM login screen and KDE itself drive the monitor properly at 1920x1200, but if I switch to a VT they all have the same 'windowed' small screen in the top left corner.

Nothing has changed in the configuration. When I built the kernel I copied the old config from /proc/config.gz and 'make oldconfig' didn't have any new questions. The problem became apparent as soon as I booted into the new kernel. If I tell grub to boot the old kernel (4.4.6) the VT's work just like before, ie, with 1920x1200 resolution, so it's clearly a kernel change somewhere between 4.4.6 and 4.4.21. Looking at the xrandr output, it appears the new kernel might be confusing the Displayport and DVI resolutions. Has anyone else run into this?

lspci:
Code:

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation H67 Express Chipset Family LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6400 Series]
03:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller
04:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)


xrandr:
Code:

Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
DisplayPort-0 connected (normal left inverted right x axis y axis)
   1024x768      60.00 
   800x600       60.32    56.25 
   848x480       60.00 
   640x480       59.94 
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200     59.95*+
   1920x1080     60.00 
   1600x1200     60.00 
   1680x1050     59.88 
   1280x1024     60.02 
   1280x960      60.00 
   1024x768      60.00 
   800x600       60.32 
   640x480       60.00 
   720x400       70.08 


The monitor is connected to the DVI output, and I'm running the open-source radeon driver.
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