On Du, 12 sep 21, 02:58:13, deloptes wrote: > Hi, > I don't know how to explain my problem, but I try hoping that someone would > understand and help me fix it. > > So I have one HP Elitebook (I think it is 820 G2) with 16GB RAM and Intel(R) > Core(TM) i5-7200U CPU @ 2.50GHz. > > The issue is that when it starts with its own display the colors are OK, but > as soon as I activate an additional display the colors get messed and it is > looking ugly like described > https://h30434.www3.hp.com/t5/Notebook-Video-Display-and-Touch/820-g1-Ubuntu-Screen-artifacts/m-p/7029819/highlight/true#M188601) Hardware -------- That link mentions using a D-SUB (you didn't specify what you are using, please do so), in which case take particular care to ensure it is properly inserted, at *both* ends. Even so, you should try using HDMI/DVI/DisplayPort instead (whichever is available). If the cable is (very) long try using a shorter, known good one, regardless of type. If you are using any kind adapters try connecting directly with the correct cable instead. Is there any difference if the laptop is connected to AC (or not)? Software -------- What Debian release is this (and kernel version if not default)? Try a newer kernel, e.g. from -backports. What driver is in use, device specific or modesetting? Try the other one instead (or the proprietary one, if applicable). Your Xorg.0.log would be useful to get more information about your hardware and software, and/or check for possible issues. Kind regards, Andrei -- http://wiki.debian.org/FAQsFromDebianUser
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