Same issue here with Radeon HD 7560D. Blank screen or resolution stuck at 600x800. Unusable. Sorry I cannot apport right now.
But I noticed one thing: booting ubuntu as UEFI has the issue. Booting the same partition from a separate Arch partition without UEFI, loaded ubuntu full resolution (keeping nomodeset though). Not sure how/if this is relevant
Same issue here with Radeon HD 7560D. Blank screen or resolution stuck at 600x800. Unusable. Sorry I cannot apport right now.
But I noticed one thing: booting ubuntu as UEFI has the issue. Booting the same partition from a separate Arch partition without UEFI, loaded ubuntu full resolution (keeping nomodeset though). Not sure how/if this is relevant