On 03/01/2018 03:50, Jack Fearnley wrote:
> On Tue, 02 Jan 2018 17:00:31 -0600, Knute Johnson wrote:
>> On 1/2/2018 16:20, Jack Fearnley wrote:
>>> When I have a screen physically attached to the RP, the image on my
>>> client screen is fine.  However, when there is no screen attached the
>>> image on my client drops to 640X480 which means that icons look huge
>>> and windows overlap the screen size.
>>
>> The simplest way I've found is to edit /boot/config.txt and add:
>>
>> framebuffer_width=1920
>> framebuffer_height=1080
>
> I looked at /boot/config and uncommented the relevant lines and it worked
> perfectly.

The effect for this is the same but I wonder if there are things that do
work differently when you leave the framebuffer dimensions commented out
and instead edit the hdmi mode settings, eg. I am used to changing:

hdmi_group=1
hdmi_mode=31

for TV mode 1080p @50 Hz. And then to make absolutely sure:

hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080

(in my case for a receiver that wrongly reported available resolutions).
See all settings at https://elinux.org/RPiconfig

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