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After upgrading my laptop (Toshiba Satellite P300 with Mobility Radeon HD 3450/3470) from Xubuntu 19.10 to 20.04, I get a black screen (it does not reach login screen). If I add nomodeset to grub, the screen works but in a wrong resolution (there is no other option on display settings to change to).

What happened during the upgrade, and how can I fix it? Any ideas?

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  • While you're in there with the wrong resolution, have you checked to see what video card drivers are loaded? Have you checked to see what happens when you change them? What have you done so far to resolve this beyond adding 'nomodeset'?
    – KGIII
    Aug 8, 2020 at 21:59
  • @KGIII I could not find anything useful by googling. I haven't checked the driver. How can I see which driver is loaded?
    – Sumac
    Aug 8, 2020 at 22:06
  • itsfoss.com/install-additional-drivers-ubuntu
    – KGIII
    Aug 8, 2020 at 22:17
  • I checked. There are no available drivers to install. My system was working very well before upgrading (there were no additional drivers used).
    – Sumac
    Aug 8, 2020 at 22:21
  • When I am running "sudo lshw -c video", I get: *-display UNCLAIMED description: VGA compatible controller product: RV620/M82 [Mobility Radeon HD 3450/3470] etc... I don't know if this helps
    – Sumac
    Aug 8, 2020 at 22:24

1 Answer 1

Reset to default
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If you can get the terminal up then enter

rm ~/.local/share/kscreen
sudo killall sddm

This black screen is legendary (in Kubuntu and Xubuntu) so guuggle it. Check this solution to Kubuntu 15.04 it should work for you too.

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  • I emptied the directories (after I backed them up) in home: .cache, .config, .local. Still nothing.
    – Sumac
    Aug 9, 2020 at 7:23
  • You could be using lightdm or gdm instead of sddm so can you try the "sudo killall" command with each of those?
    – darth_epoxy
    Aug 9, 2020 at 9:56
  • I cannot get to a terminal on black screen. If I enter through nomodeset then killing lightdm is of no use.
    – Sumac
    Aug 9, 2020 at 10:37
  • Are you getting grub up so you can choose to boot in recovery mode?
    – darth_epoxy
    Aug 9, 2020 at 10:40
  • Yes. I can enter recovery mode.
    – Sumac
    Aug 9, 2020 at 10:52

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