Turns out this is called overscan / underscan problem.
so getting closer but still not perfect, with 3.9.0-030900-generic kernel
xrandr --output HDMI-0 --set underscan on --mode 1920x1200
this way I can see my entire desktop, but there is a roughly 100 pixel black border wasting useful screen estate!
xrandr --output HDMI-0 --set underscan off --mode 1920x1200
this way the desktop probably fills up the physical display, but I can not see it all as some parts of it goes "under" the black border
3.10.9 kernel does not have this underscan issue, but no HDMI audio, otherwise the video output is just black screen
Question is still, how to get the native resolution of the screen working properly with HDMI audio if possible.
Also tried 3.11-rc7 kernel, the overscanning / underscanning issue additionally there is no HDMI audio device - same kernel config
so seems like 3.10.9 is my best bet if I can live without the audio through hdmi
using Ubuntu 13.04 Raring
I had the OSS Radeon drivers configured with 3.9.0-030900-generic kernel which I compiled and it was working very well.
The card is an ATI Radeon 5770 connected to a ViewSonic VX2835wm 28” screen through HDMI, but the results were the same through the DVI interface as well.
I am not sure what happen, but after a few apt-get upgrades it stopped working properly - maybe it is something else than upgrades not sure. There might be something going wrong with the EDID of the screen not sure, see the bottom for some tests.
In the native resolution of the screen which is 1920x1200 the desktop would overlap the physical screen, without panning. So if you put a window in full screen the edges of the window would be off the screen on the top and the two sides.
Here are some visual mockup approximation of what I could achive. The Ubuntu caption at the login screen was cut off ... The only other option I could achieve with some tweaking was to have a black border around the screen either covering up the desktop or with a downscaled version of the desktop.
Either way it was not working properly. I tried a number of things, I can not recall them exactly but eventually I gave up and tried to install the proprietary fglrx Catalyst drivers.
After installing fglrx I tried the scaling options from the control panel. When it was set 'use graphics process for scaling', I could not select 1920x1200 only 1920x1080, when it was selected to scale with 'use display for scaling' I could select 1920x1200 but I had the same black border covering up desktop space and windows overlapping the visible are when maximized. I could get 1920x1080 working by tweaking the scaling bar Underscan/Overscan option but the text was blurry I was not happy with it, I wanted the native resolution.
I decided to go back to the OSS drivers and recompile a new version of the kernel 3.10.9. After doing so and purging fglrx as described on the help wiki of ubuntu
I got a totally blank screen after boot. I tried ctrl-alt-backspace to restart X,
tried ctrl-alt-f1 .. f6 to check text consoles all of them were pitch black.
I booted the new kernel into recovery mode and after a few tries I managed to figure
out that if I boot the kernel with appending the
nomodeset option it boots into
poor graphics mode, than I run
modprobe radeon setmode=1 from a text console
restart lightdm and Im good to login in 1920x1080, after that I could use
xandr --output HDMI-0 --mode 1920x1200 and all works as expected. However
I could not figure out how to configure the system to get everything working automatically at boot time, so after each reboot I have to do the dance.
xrandr -q now shows
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192 DisplayPort-0 disconnected (normal left inverted right x axis y axis) HDMI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 708mm x 398mm 1920x1080 60.0 + 1920x1200 60.0* 1920x1080i 30.0 1680x1050 59.9 1400x1050 59.9 1280x1024 75.0 60.0 1440x900 59.9 1280x960 60.0 1152x864 75.0 1280x720 60.0 1024x768 75.1 70.1 60.0 1440x480 59.9 1440x480i 30.0 30.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 720x480 59.9 640x480 72.8 75.0 66.7 60.0 720x400 70.1 DVI-0 disconnected (normal left inverted right x axis y axis) DVI-1 disconnected (normal left inverted right x axis y axis)
*********** Something special has happened! Please contact the author,... EDID claims 1 more blocks left EDID blocks left is wrong. Your EDID is probably invalid.
while parse-edid says:
parse-edid: EDID checksum failed - data is corrupt. Continuing anyway. parse-edid: first bytes don't match EDID version 1 header parse-edid: do not trust output (if any). # EDID version 1 revision 3 Section "Monitor" # Block type: 2:0 3:ff # Block type: 2:0 3:fd # Block type: 2:0 3:fc Identifier "VX2835wm" VendorName "VSC" ModelName "VX2835wm" # Block type: 2:0 3:ff # Block type: 2:0 3:fd HorizSync 30-82 VertRefresh 50-76 # Max dot clock (video bandwidth) 150 MHz # Block type: 2:0 3:fc # DPMS capabilities: Active off:yes Suspend:no Standby:no Mode "1920x1080" # vfreq 60.000Hz, hfreq 67.500kHz DotClock 148.500000 HTimings 1920 2008 2052 2200 VTimings 1080 1084 1089 1125 Flags "+HSync" "+VSync" EndMode # Block type: 2:0 3:ff # Block type: 2:0 3:fd # Block type: 2:0 3:fc EndSection
dpkg -l | grep radeon
ii libdrm-radeon1:amd64 2.4.46+git20130702.c6d73cfe-0ubuntu0sarvatt~raring amd64 Userspace interface to radeon-specific kernel DRM services -- runtime ii xserver-xorg-video-radeon 1:7.1.99+git20130730.6a278369-0ubuntu0sarvatt~raring amd64 X.Org X server -- AMD/ATI Radeon display driver