Thanks for the quick reply, I put in the hdmi_enable_4k line and no difference.

My cmdline.txt is:

console=0 user=glenda nobootprompt=local!/dev/sdM0/fs
hdmi_group=2
hdmi_mode=82
hdmi_enable_4kp60=1
hdmi_cvt=2560 1440 60 3 0 0 1
max_framebuffer_width=2560
max_framebuffer_height=1440
hdmi_pixel_freq_limit=400000000
vgasize=2560x1440x16

It just seems like nothing I do really seems to make much difference.

Cheers

Garry
------------------------------------------
9fans: 9fans
Permalink: https://9fans.topicbox.com/groups/9fans/T42a55b55ffb81417-M7198c7cb57cfd16e8b95c984
Delivery options: https://9fans.topicbox.com/groups/9fans/subscription