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I've just installed Lubuntu 18.04 32 bits on a Benq Joybook R23 laptop.

Everything's gone fine except screen resolution is stuck at 640x480 when its ideal one is 1024x768.

Here are some test results:

spirou@spirou-Joybook-R23:~$ xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
   640x480       73.00* 
spirou@spirou-Joybook-R23:~$ echo $DISPLAY
:0

And the command lspci -v says the following about the graphics card:

01:00.0 VGA compatible controller: VIA Technologies, Inc. K8M800/K8N800/K8N800A [S3 UniChrome Pro] (rev 01) (prog-if 00 [VGA controller])
    Subsystem: Mitac K8M800/K8N800/K8N800A [S3 UniChrome Pro]
    Flags: bus master, 66MHz, medium devsel, latency 128, IRQ 11
    Memory at a4000000 (32-bit, prefetchable) [size=64M]
    Memory at e1000000 (32-bit, non-prefetchable) [size=16M]
    [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel modules: viafb

Thanks everyone!

  • I have NO experience with such a device, however wiki.archlinux.org/index.php/Via_Technologies implies backlisting the driver kernel module (driver) and more is probably what I'd try based what your list-pci shows (was it run with sudo as access denied errors are there?, results may be inaccurate/incomplete if not run with elevated privileges thus thus check before using my suggestion which is based on your current results) – guiverc Nov 23 at 21:25
  • You are right. Now using sudo: 01:00.0 VGA compatible controller: VIA Technologies, Inc. K8M800/K8N800/K8N800A [S3 UniChrome Pro] (rev 01) (prog-if 00 [VGA controller]) Subsystem: Mitac K8M800/K8N800/K8N800A [S3 UniChrome Pro] Flags: bus master, 66MHz, medium devsel, latency 128, IRQ 11 Memory at a4000000 (32-bit, prefetchable) [size=64M] Memory at e1000000 (32-bit, non-prefetchable) [size=16M] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [60] Power Management version 2 Capabilities: [70] AGP version 3.0 Kernel modules: viafb – spirou Nov 23 at 21:39
  • I've tried Linux Mint 19.2 XFCE to see if this problem didn't appear and in the try option of the OS the screen resolution was right so I've decided to overwrite the Lubuntu 18.04 partitions and install Linux MInt. However... when installation of Linux Mint has ended I've been stunned to see that once again the very same problem occurred, the only screen resolution available was 640x480. Luckily I've found the solution in this page: forums.linuxmint.com/viewtopic.php?t=280186 – spirou Nov 24 at 0:51
  • Linux Mint is neither Ubuntu, nor official flavor of Ubuntu, thus off-topic on this site, askubuntu.com/help/on-topic. I'm glad your issue was solved though. – guiverc Nov 24 at 1:07
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    @guiverc This question is about Ubuntu, not Mint. The OP had this problem on Ubuntu before ever trying Mint, and the specific technical information that has been provided about the problem itself is all from the Ubuntu system. This question is on-topic. It's possible that the solution that worked on the Mint system wouldn't work on the Ubuntu system, but it's still worth posting as an answer. I don't see a reason to close this. – Eliah Kagan Nov 24 at 12:39

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